/**
 * @file
 * Tamper-evident blockchain visualiser (Bitcoin → the-blockchain).
 */
.wl-edu-blockchain { margin: 1.5rem 0; }
.wl-edu-bc__row {
  display: flex;
  gap: 0.9rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}
.wl-edu-bc__block {
  flex: 1 1 0;
  min-width: 190px;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 0.85rem;
  border-radius: var(--radius-lg, 12px);
  background: var(--color-bg-surface, #0b1020);
  border: 2px solid;
  position: relative;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.wl-edu-bc__block.is-valid {
  border-color: rgba(16, 185, 129, 0.55);
  box-shadow: 0 0 0 1px rgba(16, 185, 129, 0.15);
}
.wl-edu-bc__block.is-invalid {
  border-color: rgba(239, 68, 68, 0.7);
  box-shadow: 0 0 18px rgba(239, 68, 68, 0.25);
}
/* Chain connector arrows between blocks. */
.wl-edu-bc__block:not(:last-child)::after {
  content: "→";
  position: absolute;
  right: -0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted, rgba(255, 255, 255, 0.35));
  z-index: 1;
}
.wl-edu-bc__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-text-primary, #fff);
}
.wl-edu-bc__badge {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
}
.is-valid .wl-edu-bc__badge { background: rgba(16, 185, 129, 0.18); color: #10b981; }
.is-invalid .wl-edu-bc__badge { background: rgba(239, 68, 68, 0.18); color: #ef4444; }
.wl-edu-bc__block label {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted, rgba(255, 255, 255, 0.45));
}
.wl-edu-bc__field {
  width: 100%;
  padding: 0.35rem 0.45rem;
  border-radius: 6px;
  border: 1px solid var(--color-border-subtle, rgba(255, 255, 255, 0.12));
  background: rgba(0, 0, 0, 0.3);
  color: var(--color-text-primary, #fff);
  font-size: 0.82rem;
  text-transform: none;
  letter-spacing: normal;
  resize: vertical;
}
.wl-edu-bc__data:focus { outline: 2px solid var(--color-accent-primary, #003bff); outline-offset: 1px; }
.wl-edu-bc__mono { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: 0.72rem; }
.is-invalid .wl-edu-bc__hash { color: #ef4444; }
.is-valid .wl-edu-bc__hash { color: #10b981; }
.wl-edu-bc__mine {
  margin-top: 0.25rem;
  padding: 0.4rem;
  border: 0;
  border-radius: 6px;
  background: var(--color-accent-primary, #003bff);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}
.wl-edu-bc__mine:hover { background: var(--color-accent-hover, #194eff); }